regular-mail

基本解释

Regular E-mail messages cannot contain computer viruses, but attachments can.
常规的电子邮件正文不能包含计算机病毒，但附件却可以。
To file a counter notification with us, you must provide a written communication (by fax or regular mail -- not by email, except by prior agreement.
请您务必以书面（传真或邮寄信件）的通讯方式向我们提交“反通知”（除非有事先经百度同意，请勿使用电子邮件方式提交通知）。
After an interview, send a thank-you note (via e-mail or regular mail) to show your gratitude to the interviewer for taking the time to meet with you.
面试过后，发一封感谢信（通过电子邮件或是信件）来表达你对面试官花时间见你的感谢之情。

Her back-office system, the latest version from Dayton, Ohio-based Reynolds and Reynolds, automatically sends out discount coupons by e-mail or regular mail, alerting customers to 10, 000-mile checkups or extended-warranty offers.
FORBES: Dealers 1 Internet 0
He gives the example of e-mail: in a way, it is much the same as regular mail but faster.
ECONOMIST: Eventually, bigger means different